I hacked my Oakley multimixers so that they can act as a bias source.
It definately is a great thing to have around. I like your idea of
using 2.500V with a gain of +/- 2 (rather than unity gain). Hmmm, I
may have to hack my multimixers again.
At 12:17 AM -0500 2003/02/23, The Old Crow wrote:
> At the behest of Robert Rich, I built a triple reversing+bias module to
>his specifications. Each stage provides -/+ 5V bias in the absence of a
>jacked input, and as each output is used, it is removed from being summed
>with the next stage. All stages have a gain of -2 to +2. Thus you have a
>3-to-1 mixer, or a gain stage with bias, etc. Formulaically:
>
> 2.500V
> |
> IN_A ∗ (-2 to +2) = OUT_A
> |
> 2.500V |
> | |
> IN_B ∗ (-2 to +2) + OUT_A = OUT_B
> |
> 2.500V /------/
> | |
> IN_C ∗ (-2 to +2) + OUT_B = OUT_C
>